https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79205
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.
Breakpoint 1, fancy_abort (
file=0x1e2fb90 "/space/rguenther/src/svn/gcc-7-branch/gcc/gimple-expr.c",
line=473,
function=0x1e2fd73 <create_tmp_var(tree_node*, char const*)::__FUNCTION__>
"create_tmp_var") at
/space/rguenther/src/svn/gcc-7-branch/gcc/diagnostic.c:1461
1461 internal_error ("in %s, at %s:%d", function, trim_filename (file),
line);
Missing separate debuginfos, use: zypper install
libgmp10-debuginfo-5.1.3-5.46.x86_64 libisl15-debuginfo-0.16.1-30.30.x86_64
libmpc3-debuginfo-1.0.2-4.55.x86_64 libmpfr4-debuginfo-3.1.2-11.53.x86_64
(gdb) up
#1 0x0000000000ddb5da in create_tmp_var (type=
<record_type 0x7ffff575d1f8 tuple>, prefix=0x0)
at /space/rguenther/src/svn/gcc-7-branch/gcc/gimple-expr.c:473
473 gcc_assert (!TREE_ADDRESSABLE (type) && COMPLETE_TYPE_P (type));
(gdb) p debug_tree (type)
<record_type 0x7ffff575d1f8 tuple sizes-gimplified addressable
needs-constructing type_1 type_5 type_6 BLK
size <integer_cst 0x7ffff68c4108 type <integer_type 0x7ffff68c10a8
bitsizetype> constant 32>
gimplifying **t in
;; Function int foo(std::tuple<int>) (null)
;; enabled by -tree-original
{
struct tuple D.33733 = **t;
type & x0;
struct tuple D.33733 = **t;
type & x0;
<<cleanup_point <<< Unknown tree: expr_stmt
(void) (x0 = (type &) std::get<0, int> ((struct tuple &) &D.33733)) >>>>>;
return <retval> = *x0;
}
gcc 6 rejects this with
t.C: In function ‘int foo(std::tuple<int>)’:
t.C:5:8: error: expected unqualified-id before ‘[’ token
auto [x0] = t;
^
t.C:6:12: error: ‘x0’ was not declared in this scope
return x0;
^~
